Originally Posted by
Bakun
I always used to think that Kakkashi only covered his sharingan as sort of a concealed weapon, but now it's pretty obvious it was because he realized he'd go blind - if he'd kept it exposed like he did between the time Obito gave it to him and 'now'. This is the third (and most likely the last) time Kakkashi had his life saved by Obito. Not to mention that...by saving his life, Obito was doing Konoha a big favor at the same time by keeping the Sharingan out of the Hidden Mist's hands.
This chapter wasn't just about Obito's rage and extremely rapid development through hate (also explains why he's pushing Sasuke along the same path,) this chapter explains alot of details that many people overlook.